I deposited some btc a few days ago and thought to win atleast double it. But lost it in a couple of hours instead.

Havent tried keno before so maybe I should give it a try to see if it is more lucky then the games in which I tried out like plinko and blackjack.

it means that luckiness has not come to you, but it might come another day.
I simply visited gambling sites, and play less than 10 rounds per day, with small
BTC.
Following this rule help don't fall into gambling addiction.
Some days I win more than lose, some days I lose more than win.